function image_switch(img_name, num){

	if (document.images && document.images[img_name]){
                img_obj = document.images[img_name];
		img_name = img_name.replace('_bottom','');
		img_obj.src = '/images/' + img_name + num + '.gif';
	}
}

function preload(num1, num2, imgs) {
	var new_img = new Array();
	var i = 0;
	for (im in imgs) {
		new_img[i] = new Image();
		new_img[i].src = '/images/' + imgs[im] + num1 + '.gif';
		new_img[i].width = 80 
		new_img[i].height = 30
		i++;
		new_img[i] = new Image();
		new_img[i].src = '/images/' + imgs[im] + num2 + '.gif';
		new_img[i].width = 80 
		new_img[i].height = 30
		i++;
	}
}